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Finding the Fourth Proportional to 75.20, 112.49 and 55.99

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Solution

The fourth proportional to 75.20, 112.49 and 55.99 is: 83.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    75.20 : 112.49 = 55.99 : x
  2. Step 2: Convert to fraction form
    75.20/112.49 = 55.99/x
  3. Step 3: Cross multiply
    75.20x = 112.49 × 55.99
  4. Step 4: Simplify right side
    75.20x = 6,298.39
  5. Step 5: Solve for x
    x = 6,298.39/75.20
  6. Step 6: Final answer
    x = 83.76

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.